多级孔beta沸石催化合成聚甲氧基二甲醚  

Synthesis of Polyoxymethylene Dimethyl Ethers with Hierarchical Beta Zeolite

作　　者：郭显栋 覃士和 廖奕涵 焦阳 王宝宇 颜曦明 Guo Xiandong;Qin Shihe;Liao Yihan;Jiao Yang;Wang Baoyu;Yan Ximing(Guangxi Key Laboratory of Green Chemical Materials and Safety Technology,Beibu Gulf University,Qinzhou 535011,China)

机构地区：[1]北部湾大学广西绿色化工新材料与安全技术重点实验室,广西钦州535011

出　　处：《广东化工》2022年第22期30-32,4,共4页Guangdong Chemical Industry

基　　金：广西自然科学基金资助项目(2020GXNSFAA297072);广西高校中青年教师基础能力提升项目(2022KY0413);北部湾大学大学生创新创业训练计划资助项目(202111607011)。

摘　　要：将碱处理改性的beta沸石用于甲缩醛和三聚甲醛合成聚甲氧基二甲醚。结果表明碱刻蚀沸石可形成多级孔道结构且并未改变原有的沸石晶型,随着碱浓度的增加沸石结晶度有先增大后减少,外表面积不断增大,中孔孔容呈火山型曲线趋势。与未改性沸石相比,经0.3 mol/L NaOH处理后的样品,目的产物收率最高可达61.35%,改性后beta沸石达到化学平衡所用反应时间缩短了近1倍。Alkali-treated beta zeolite was used to synthesize polyoxymethylene dimethyl ethers from dimethoxymethane and trioxane.The results show that the alkaline etched zeolite can form a hierarchical pore structure without changing the original zeolite crystal structure.With the increase of alkali concentration,the crystallinity of zeolite first increases and then decreases,the external surface area increases continuously,and the mesoporous volume has a volcanic trend.Compared with the unmodified beta zeolite,the activity of the modified beta zeolite was improved,and the highest yield was 61.35%after treatment with 0.3 mol/L NaOH.The reaction time for the modified beta zeolite to reach chemical equilibrium was shortened by nearly 1 times.

关 键 词：碱处理 活性 沸石 多级孔结构 聚甲氧基二甲醚 

分 类 号：TE65[石油与天然气工程—油气加工工程]